Vogt1 - Circles

Circles in Nature
Circle 2.png

Formula for Area of a Circle

Area = Pi * Radius * Radius
Pi = 3.14
Radius = distance from the center of the circle to the outside (half of the diameter)

Example:Find the area of a circle with a diameter length of 20.
Area = Pi * 10 * 10
Area = (3.14) * 10 * 10
Area = 314

Watch this video for extra explanation on how to find the area of a circle!

http://www.youtube.com/watch?v=ghSBNOt-b-U

This website has good information on circles. Go to it for more examples.

http://www.mathsisfun.com/geometry/circle.html